Different meta-analytical approaches to assess TCF4 rs9960767 genotype effects on mean percentage PPI across both investigated samples [healthy volunteers from London, UK (n = 96), and a schizophrenia spectrum sample from Bonn, Germany (n = 105)]
| Effect size | Z | p value | |
|---|---|---|---|
| Fisher's trend | — | — | 0.0002 |
| Stouffer's z trend method | — | — | 0.0001 |
| Weighted integration methoda | d+ = 0.94 | 4.12 | 0.00002 |
| Random-effects modela | Delta = 0.94 | 4.12 | 0.00002 |
↵aAccording to Hedges and Olkin (1985).